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    <p>You are failing to specify any <code>weightx</code> and <code>weighty</code> values to the <code>GridBagConstraints</code>. Moreover your <code>gridwidth</code> values are wrong, since it only needs to be <code>2</code> for the bottom most <code>JPanel</code>, for the rest it needs to be <code>1</code>. </p> <hr> <p><strong>Explanation of what I am doing :</strong> Consider <code>JPanel</code>s <code>BLUE</code> and <code>RED</code>, they are to be placed along the <strong>X-AXIS</strong>, in the ratio <code>70:30</code>, with respect to each other (therefore their <code>weightx</code> will be <code>0.7</code> and <code>0.3</code> respectively. Since the total area along the <strong>X-AXIS</strong> is <code>1.0</code>). </p> <p>Now both of these <code>BLUE</code> and <code>RED JPanel</code>s are to be placed along the <strong>Y-AXIS</strong>, with respect to the third <code>GREEN JPanel</code> in the ratio <code>90:10</code>, therefore, both of these <code>BLUE</code> and <code>RED</code> will have <code>weighty = 0.9</code>, and the <code>GREEN JPanel</code> will have <code>weighty = 0.1</code>, but since <code>GREEN JPanel</code> is suppose to occupy the whole area (with respect to <strong>X-AXIS</strong>), as occupied by <code>BLUE</code> and <code>RED JPanel</code>s, for that matter, its <code>gridwidth = 2</code> and <code>weightx = 1.0</code>.</p> <hr> <p>Try this code example : </p> <pre><code>import java.awt.*; import javax.swing.*; public class GridBagLayoutExample { private GridBagConstraints gbc; public GridBagLayoutExample() { gbc = new GridBagConstraints(); gbc.anchor = GridBagConstraints.FIRST_LINE_START; } private void displayGUI() { JFrame frame = new JFrame("GridBagLayout Example"); frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); JPanel contentPane = getPanel(Color.WHITE); contentPane.setLayout(new GridBagLayout()); JPanel leftPanel = getPanel(Color.BLUE); JPanel rightPanel = getPanel(Color.RED); JPanel bottomPanel = getPanel(Color.GREEN.darker()); addComp(contentPane, leftPanel , 0, 0, 0.7, 0.9, 1, 1, GridBagConstraints.BOTH); addComp(contentPane, rightPanel , 1, 0, 0.3, 0.9, 1, 1, GridBagConstraints.BOTH); addComp(contentPane, bottomPanel , 0, 1, 1.0, 0.1, 2, 1, GridBagConstraints.BOTH); frame.setContentPane(contentPane); //frame.pack(); frame.setSize(300, 300); frame.setLocationByPlatform(true); frame.setVisible(true); } private void addComp(JPanel panel, JComponent comp , int gridX, int gridY , double weightX, double weightY , int gridWidth, int gridHeight, int fill) { gbc.gridx = gridX; gbc.gridy = gridY; gbc.weightx = weightX; gbc.weighty = weightY; gbc.gridwidth = gridWidth; gbc.gridheight = gridHeight; gbc.fill = fill; panel.add(comp, gbc); } private JPanel getPanel(Color backColour) { JPanel panel = new JPanel(); panel.setOpaque(true); panel.setBackground(backColour); panel.setBorder( BorderFactory.createEmptyBorder(5, 5, 5, 5)); return panel; } public static void main(String[] args) { Runnable runnable = new Runnable() { @Override public void run() { new GridBagLayoutExample().displayGUI(); } }; EventQueue.invokeLater(runnable); } } </code></pre> <p>Here is the OUTPUT of the same : </p> <p><img src="https://i.stack.imgur.com/KDqB1.png" alt="GridBagLayoutExample"></p>
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